v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories - Impact on cash flow (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income ¥ 3,600,382 $ 513,877 ¥ 2,955,709 ¥ 2,844,037
Changes in operating assets and liabilities:        
Inventories (436,581) (62,313) (276,518) (983,126)
Accrued expenses and other liabilities 932,174 133,048 677,863 674,013
Net cash provided by operating activities 6,091,062 $ 869,371 4,229,272 2,900,425
As previously reported        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income 3,604,617   2,931,703 2,847,933
Changes in operating assets and liabilities:        
Inventories (442,226)   (244,510) (988,322)
Accrued expenses and other liabilities 933,584   669,861 675,313
Net cash provided by operating activities 6,091,062   4,229,272 2,900,425
Effect of Change        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (4,235)   24,006 (3,896)
Changes in operating assets and liabilities:        
Inventories 5,645   (32,008) 5,196
Accrued expenses and other liabilities ¥ (1,410)   ¥ 8,002 ¥ (1,300)